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G.VM.LUNGREN. I DYNAMO ELEGTRIU MACHINE. No. 294,892. Patented Mar. 11,1884.

Nv PETERS, Phowlilhagnpher, Walhi nnnnnnn c.

UNITED STATES PATENT Fries.

CHARLES M. LUNGREN, OF NEIV YORK, N. Y.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent "No. 294,892, dated March11, 1884.

Application filed November 22, 1882. Renewed August 14, 1883. (domodel.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES MARsHALL LUNGREN, of the city and State ofNew York,

have invented an Improvement in Dynamo- Electrie Machines, of. which thefollowing is a specification.

With the ordinary dynaino-machine--that is, a machine in whichfield-magnets are placed in the working-circuit-the current generatedvaries in accordance with the varitions in the resistancesin thelinecircuit when these resistances are arranged in multiple arc. In sucha circuit-containing incandescent lamps, for instance-the resistance isincreased when lamps are cut out, less current flows through'thecircuit, and the field is proportionally cut down. \Vhen lamps areadded, the reverse takes place, the resistance decreasing and thecurrent increasing. Such an arrangement has the disadvantage, however,that unless the external resistance is comparatively low thefield-magnets will not become charged. In working with incandescentlamps of high resistance, therefore, quite a number must be in circuitbefore the machine will generate a current, and hence this arrangementis not satisfactory in operating such lamps. The field has thereforebeen heretofore placed in a shunt-circuit, and its strength varied inaccordance with the de mands in the working-circuit by inserting orremoving resistance in this shuntcircuit.

. These resistances have been operated both by hand and by means ofvarious devices operated by the current.

It is the object of my present invention to provide a dynamo-machinewhich will respond automatically to the variations of resistance in amultiple-arc working-circuit, so that the power required will beproportional to the work to be done. I accomplish this object byproviding two distinct circuits around the cores of the field-magnets,as is done in the invention for which Letters Pat ent of the UnitedStates were granted to O. D. Haskins and myself July 11, 1882, No.260,866; but I arrange the circuits so that the effect is the oppositeof that there shown. One of these circuits is always closed, and

constitutes one of the magnetizing-coils of the field. The other,instead of including the lights or other working devices, as in thepreviousinvention, is a shunt-circuit from the multiple-arc circuit, inwhich the lights or other working devices are placed. These op posedcircuits, being for the purpose of varying the strength of the field inaccordance with the variations in resistance in the working-circuit, maybe applied in any way which will accomplish this object. The coils maybe wound as shown in Figure 1, so that the magnetic effects oppose eachother, or they be wound differentially, as in Fig. 2.

My invention may he applied to one machine with double commutators, orto two or more machinesarranged so as to constitute one generator.

In Fig. 1, F represents the polar portion of the U -magnets M N. A isthe armature, and O and G the commutators. Part of the coils or heliceson the armature A are led to the commutator O, and theothers to thecommutator O. The current generated in the former is passed through thecoils f around the legs of the magnet M, and that generated in thelatter is sent through the multiple-arc circuit L, in which are placedthe lamps or other working devices, Z Z. From this latter circuit ashunt-circuit is taken and passed around the legs of vthe magnet Nthrough the coils f in adirection opposed to the current through thecoils f.

In Fig. 2 the opposing coils on the fieldmagnets are shown wounddifferentially with regard to each other and over both magnets.

The current from the commutator C is in this.

casepassed through coilswound over the legs of both magnets M N, andthat shunted from the working-circuit is likewise passed around the legsof both magnets, but in a reverse direction to the other current. Thesetwo fieldcoils may be proportioned in both cases so that the field willbe without magnetism when the light or working circuit is open;butIprefer to make the relation of these coils such that under the abovecondition the field will be feebly charged. As working devices are introduced in the circuit L the resistance of this circuit becomes less,and consequently less of the current taken off at the commutator G willpass through the shunt-circuit f, and the field F will be magnetized inproportion to the excess of current passing through the coils fover thatcirculating in the coils f. To apply this construction to a number ofmachines, so asto make them equivalent to one generator, it is onlynecessary to join the field-circuits of all the machines, so that they(the field-circuits) are common to them all, ai'id'therel'ore subject tothe same conditions. Such an arrangement is shown in Fig. .5. Thecurrent generatedin the armature A is passed around the field-magnets ofeach machine. The like poles of the two machines shown havingcommutators (J and C are connected together, and the current generatedin their armatures A and A sent through the 1nultiple-arc circuit L. Theshunt-circuit f is passed around the field-magnets of each machine, asshown. A number of machines arranged in this way will then act preciselythe same as the one machine with two commutators. I

I claim as my invention 1. The combination of two or more dynamoelectric machines with two circuits and a shunt to one of thecircuits, the first of such circuits passing through one field-helix ofeach generator, and through one or more of the armature-hellces, thesecond circuit passing through one or more armattire-helices tlxroughthe external working-circuit and a shunt through reactionary helices inthe field-magnets, sub stantially as specified.

2. In a dynamo-elect-ric generator with an external circuit andresistances in multiple are, two circuits, both of which pass throughthe iield-helices diiferentially, and through armature-helices, one ofwhich circuits is electrically distinct from the workingcircuit, and theother of which is a shunt-circuit from the working-circuit,substantially as specified.

3. In a dynamo-electric machine, two independent circuits, one of whichhas a shunt circuit, the first circuit passing through anarmature-helix, and through one of the field helices, the other circuitthrough an armature helix and the working-circuit, and the shunttherefrom passing through a helix of the field, so as to set upreactionary magnetism in proportion to the resistance in theworking-circuit, substantially as specified.

Signed by me this 6th day of October, A. j

U. M. LITNG'REN.

'\\"itnesscs:

HAROLD SERREL'L, GEO. T. IINCKNIQY.

